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Reservoir Character and Main Control Factors
in the Upper Second Member of Shahejie
Formation(Es2) in the Linnan Subsag
Reporter: Feng Yuelin
Co-supervisor: Song Guoqi
Major: Hydrocarbon Accumulation
Contents
1.Introduction
2.Sedimentary character in study area
3.Reservoir assessment in study area
4.Conclusion and thought
1 Introduction
Lin nan subsag located in the west of Huimin sag, the southeast of
the Bohai Bay basin, which an important petroliferous basin of China.
The Linnan subsag The Huimin sag The Bohai Bay Basin
Proved reserves of each member in Linnan Susag
Proved reserves of Es2
Contents
1.Introduction
2.Sedimentary character in study area
3.Reservoir assessment in study area
4.Conclusion and thought
J202 3704.55m
Parallel bedding
J202 3763.5m
Boring porisity
J202 3680.77m
Parallel bedding
JX2 3818.51m
Parallel bedding
X33 3256.6m
Coarse sand X53 2980.33m
Parallel bedding
X53 2980.53m
Cross bedding
X70 3266.46m
Wavy ripple
cross-bedding
X33 X53
JX2
J202
X70
2 Sedimentary Character
T2
T3
T6
T4
SP R25
J4 X704
SP R25
X704 J3 J4 J5 X39 X99 S547 S546
Distributary shape
Bell-shaped Funnel shape
Fluvial facies
Delta sedimentary facies
Es2
Shuang Feng Area Jiang Jiadian Area Wa Wu Area
Braided delta facies progradating to
the central depression
Braided delta facies Braided delta facies
Braided fluvial facies Braided delta facies
Early stage: braided fluvial facies, the
sandbody connected well
Later stage: covered by channel sand,
vertical overlay but lateral connected
poor
Sand thickness isopach map
The thickness of sand increased especially at the Shuang Feng district
Contents
1.Introduction
2.Sedimentary character in study area
3.Reservoir assessment in study area
4.Conclusion and thought
3 Reservoir Assessment Sorting
Overwater distributary channel
Underwater distributary channel
Delta front mouth bar
Braided river channel sand
3 Reservoir Assessment
Overwater distributary channel
Underwater distributary channel Delta front mouth bar
Braided river channel sand
Psephicity
Round
Round Round
Round
Semiround
Semiround Semiround
The type of
motherrock
The type of
lay mineral
Magmatic
rock
Metamorphic
rocks
Sedimentary
rocks
kaolinite illite chlorite
Overwater distributary channel:lithic feldspar
sandstone and feldspar lithic sandstone
Underwater distributary channel: lithic
feldspar sandstone
Delta front mouth bar: lithic feldspar
sandstone
Braided river channel sand:lithic feldspar
sandstone
X70-2687.6m-Calcite cementation J3,3713.7m-Ankerite cement
X70-3074.3m-Ankerite cement X33,3293.12m-Dolomite cementation cementation
Macropore:interparticle porosity、intercrystalline pore、dissolved pore
Micropore:Kaolinite intercrystal pore
Feldspar dissolved pore
Classification of pore
微孔隙
粒间孔
长石溶孔
街斜2,3779.4- 长石颗粒溶解,200x(-)
Abundant of primary porosity, the solution porosity occurred in Yingzijie area
J202,3767.1m, residual primary
interparticle porosity pore,100×(-
)
X33,3295.5m, kaolinite
intercrystalline pore,200×(-) J202,3773.4m, primary interparticle
porosity pore,200×(-)
J3,3716.8m, kaolinite
intercrystalline pore,200×(-) Jx2,3779.4.6m, kaolinite solution
pore,200×(-)
J202,3795.6m, kaolinite marginal
solution pore,200×(-)
well Depth m
Prosity (%)
permeability ×10-3µm2
The pore radius
µm
Max of pore radius
µm
Hg(50%)MPa Hg(max)%
average coefficient of
variation
X70
3264.4 16.2 211 6.83 22.03 0.29 86.09 0.99
3267.71 17.9 34.6 2.39 5.95 0.56 80.37 0.75
3268.58 17.8 87.8 3.65 10.02 0.44 82.17 0.84
X32 3290.52 18.9 113.7 4.48 13.53 0.38 84.15 0.88
3291.39 19.6 289.3 6.43 13.99 0.26 83.96 0.83
X70 3264.4m X70 3267.7m
Section conclusion
1. Sedimentary facies of Es2 is from braided river delta change into
braiding river
2. The main reservoir types are Overwater distributary channel
reserviors, underwater distributary channel reservoirs, delta
front mouth bar reservoirs and braided river channel sand
reservoirs.
3. The five types of reservoirs have good condition to accumulate
hydrocarbons or to become the migrate pathways.
Contents
1.Introduction
2.Sedimentary character in study area
3.Reservoir assessment in study area
4.Conclusion and thought
25%-27% 15%-17% 19%-23%
31%-33% 31%-36% 36%-43%
17%-27%
X705 X321 X704 J3 J4 J206 J204 L98 L981 L86 Ls1
Xx961 Xx96 X906
4 Conclusion and thought
The sand in upper Es2 connected well and good physical property. The connected sandbody can become the good hydrocarbon migration layer .
Fault 1、transporting
2、sealing
Hydrocarbon accumulation model
Hydrocarbon migrate along the fault and accumulate in the traps.
Xx96 x906
100米
110米
150米
130米 90米
180米
100米
210米
300米
130米 150米
160米
150米
100米 50米
10米
150
200
250 300
100
50
0
夏90
夏斜502
150米
30米
20米
夏47
夏460
夏906
夏96
Fault sealing mode
Oil Reservoirs Profile in Linan Subsag
Map of fault throw distribution
The sedimentary facies in the Linnan subsag of Es2 changes from braided delta facies to
braided fluvial facies. There exist five types of reservoirs, each reservoir has its own
character. In the center Linnan subsag, the layers besides the fault vertically has great
conducting condition, in the frontier of the basin, hydrocarbon migrate laterally along the
sand. The burial of Es2 is relative shallow. Under the effect of the fault sealing, the thin
sand is more liable to accumulate the hydrocarbon and the thick sand is more liable to
become the hydrocarbon migration pathways.
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